How to go about resigning?

Ja

I am a student wanting to resign to focus on my education. The thing is I work shifts when my boss isn’t in. I don’t see her often, it’s pretty rare. She is there M-F, I am an on call worker that does weekends. Due to school I can’t schedule a time to visit my workplace in between the hours she is there. ( I live about 40 min away) Is it adequate to text her letting her know I’m submitting my resignation at her door?